package com.wang.gallerybackend.aop;

import com.wang.gallerybackend.annotation.AuthCheck;
import com.wang.gallerybackend.exception.BusinessException;
import com.wang.gallerybackend.exception.ErrorCode;
import com.wang.gallerybackend.model.entity.User;
import com.wang.gallerybackend.model.enums.UserRoleEnum;
import com.wang.gallerybackend.service.UserService;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;

@Aspect
@Component
public class AuthIntercepter {
	@Resource
	private UserService userService;

	/**
	 * 执行拦截
	 * @param joinPoint 切入点
	 * @param authCheck 权限注解
	 */
	@Around("@annotation(authCheck)")
	public Object doInterceptor(ProceedingJoinPoint joinPoint, AuthCheck authCheck) throws Throwable {
		String mustRole = authCheck.mustRole();
		RequestAttributes requestAttributes = RequestContextHolder.currentRequestAttributes();
		HttpServletRequest request = ((ServletRequestAttributes) requestAttributes).getRequest();
		//获取当前登录用户
		User loginUser = userService.getLoginUser(request);
		UserRoleEnum mustRoleEnum = UserRoleEnum.getEnumByValue(mustRole);
		//如果不需要权限放行
		if (mustRoleEnum == null) {
			return joinPoint.proceed();
		}
		//必须有权限才能通过
		UserRoleEnum userRoleEnum = UserRoleEnum.getEnumByValue(loginUser.getUserRole());
		if(userRoleEnum == null ){
			throw new BusinessException(ErrorCode.NOT_AUTH_ERROR);
		}
		//必须有管理员权限
		if(UserRoleEnum.ADMIN.equals(mustRoleEnum)&&!UserRoleEnum.ADMIN.equals(userRoleEnum)){
			throw new BusinessException(ErrorCode.NOT_AUTH_ERROR);
		}
		return joinPoint.proceed();
	}
}
